it was a speech that changed the national debate on civil rights. well, here we are with an election 30 days away. and the debates are in spule swing. a new book, presidential courage, three speeches that changed america, takes a look at the moments that have truly inspire period our nation. warren kozak is the author and he is here live. >> thanks for having me on. >> jamie: this is inspiring. you certainly did your homework. i read the speeches, one is four paragraphs. >> linkon's second inaugural, four paragraphs. can you believe that? >> jamie: what does it take to inspire a nation? how important are the words that the presidents and presidential candidates say? >> critical, but what we are looking at are 3 speech, three presidents, three incredibly important junctures in our history. really the most dangerous momes in our history. and these three presidents through their words were able to give the country courage to make the changes that needed to be made. you don't hear that anywhere. >> jamie: you cover fdr, jfk and lincoln. how did you pick